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首页> 外文期刊>Hydrogeology journal >The effects of a dry sand layer on groundwater recharge in extremely arid areas: field study in the western Hexi Corridor of northwestern China
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The effects of a dry sand layer on groundwater recharge in extremely arid areas: field study in the western Hexi Corridor of northwestern China

机译：干沙层对极端干旱地区地下水补给的影响：中国西北河西走廊的实地研究

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摘要

Evaporation capacity is an important factor that cannot be ignored when judging whether extreme precipitation events will produce groundwater recharge. The evaporation layer's role in groundwater recharge was evaluated using a lysimeter simulation experiment in the desert area of Dunhuang, in the western part of the Hexi Corridor in northwestern China's Gansu Province. The annual precipitation in the study area is extremely low, averaging 38.87 mm during the 60-year study period, and daily pan evaporation amounts to 2,486 mm. Three simulated precipitation regimes (normal, 10 mm; ordinary annual maximum, 21 mm; and extreme, 31 mm) were used in the lysimeter simulation to allow monitoring of water movement and weighing to detect evaporative losses. The differences in soil-water content to a depth of 50 cm in the soil profile significantly affected rainfall infiltration during the initial stages of rainfall events. It was found that the presence of a dry 50-cm-deep sand layer was the key factor for Bpotential recharge<^> after the three rainfall events. Daily precipitation events less than 20 mm did not produce groundwater recharge because of the barrier effect created by the dry sand. Infiltration totaled 0.68 mm and penetrated to a depth below 50 cm with 31 mm of rainfall, representing potential recharge equivalent to 1.7 % of the rainfall. This suggests that only extreme precipitation events offer the possibility of recharge of groundwater in this extremely arid area.
机译：在判断极端降水事件是否会产生地下水补给时，蒸发能力是一个不可忽视的重要因素。在中国西北部河西走廊西部的敦煌沙漠地区，通过蒸渗仪模拟实验，评估了蒸发层在地下水补给中的作用。研究区域的年降水量极低，在60年的研究期内平均为38.87毫米，而每天的平均蒸发量为2486毫米。溶渗仪模拟中使用了三种模拟的降水方式（正常为10毫米;常年最大值为21毫米;极限为31毫米），以监测水的流动并进行称重以检测蒸发损失。在降雨事件的初始阶段，土壤剖面中50 cm深度的土壤水分含量差异显着影响了降雨的入渗。发现在三场降雨事件之后，深50厘米深的干燥沙层的存在是势能补给的关键因素。由于干沙产生的屏障效应，每天少于20毫米的降水事件不会产生地下水补给。渗透总量为0.68毫米，渗透到50厘米以下的深度，降雨量为31毫米，表示潜在的补给量相当于降雨的1.7％。这表明只有极端降水事件才有可能在这个极度干旱的地区补充地下水。

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